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A single frequency point of 2.625 GHz exceeded the limit when the controller of parking auxiliary system carried out radiatied emission test of components, which did not meet the requirements of Electromagnetic Compatibility(EMC) Specs. By checking and analyzing the near and far field of the whole test link and Printed Circuit Board(PCB), it is found that the source of the noise is the Ethernet clock signal on PCB, and the clock and corresponding chip are not applied in this parking auxiliary system. The clock signal is radiated through the unintentional antenna formed by the broken line on the PCB board, resulting in the radiatied emission exceeding the limit. The reason why the radiation emission exceeded limits, and the process of discovering is described in detail, combined with theory and practice. By updating relevant software, turn off the clock driver, the problem of exceeding the limit of radiation emissied is solved at a low cost.
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零部件辐射发射测试时泊车辅助系统控制器在2.625 GHz单频点出现频点超标问题,不符合零部件电磁兼容性(EMC)设计规范要求。为了详细分析问题产生原因,通过对整个测试链路及印刷电路板(PCB)进行远、近场排查分析,最终定位噪声源头为泊车辅助系统控制器内部冗余未应用的千兆以太网时钟信号,该时钟信号通过PCB上断折线形成的无意天线对外辐射,从而导致辐射发射测试超标。通过采用更新软件,关闭该时钟驱动,低成本解决了泊车辅助系统控制器辐射发射超标问题。
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| 排查过程 | 测试结果 | 备注 |
| 试验设备及场地确认 | - | 排除场地影响 |
| 断开4路摄像头 | 不通过 | 排除摄像头影响 |
| 断开4路摄像头及8路雷达 | 不通过 | 排除雷达影响 |
| 仅保留控制器电源,断开其他所有线束 | 不通过 | 排除信号线影响 |
在序号4的基础上取消外壳 接地 | 不通过 | 排除接地影响 |
| 在序号5的基础上进行控制器外壳屏蔽处理 | 通过 | 确认失效真因 |
在序号6的基础上增加外壳 接地 | 通过 | 确认接地不影响测试结果 |
), ArticleFig(id=1200389255102058925, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1200389248433115427, language=CN, label=表1, caption=
排查结果汇总
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| 排查过程 | 测试结果 | 备注 |
| 试验设备及场地确认 | - | 排除场地影响 |
| 断开4路摄像头 | 不通过 | 排除摄像头影响 |
| 断开4路摄像头及8路雷达 | 不通过 | 排除雷达影响 |
| 仅保留控制器电源,断开其他所有线束 | 不通过 | 排除信号线影响 |
在序号4的基础上取消外壳 接地 | 不通过 | 排除接地影响 |
| 在序号5的基础上进行控制器外壳屏蔽处理 | 通过 | 确认失效真因 |
在序号6的基础上增加外壳 接地 | 通过 | 确认接地不影响测试结果 |
), ArticleFig(id=1200389255219499438, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1200389248433115427, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 对策方案 | 验证结果 | 成本分析 |
| 千兆以太网芯片上件 | 通过 | 增加成本 |
| 通过软件关闭时钟驱动 | 通过 | 不增加成本 |
| 控制器外壳缝隙屏蔽优化 | 通过 | 增加成本 |
| 时钟总线末端接电阻 | 通过 | 需改版 |
), ArticleFig(id=1200389255378882992, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1200389248433115427, language=CN, label=表2, caption=
失效对策方案汇总
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| 对策方案 | 验证结果 | 成本分析 |
| 千兆以太网芯片上件 | 通过 | 增加成本 |
| 通过软件关闭时钟驱动 | 通过 | 不增加成本 |
| 控制器外壳缝隙屏蔽优化 | 通过 | 增加成本 |
| 时钟总线末端接电阻 | 通过 | 需改版 |
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